This high-quality hook and bobbin case assembly is designed to fit a range of Singer sewing machines, including models 211W151, 211G146, 211G151, 211G157, 212W140, 212W145, 212W146, 212G140, 212G141, and 212G145. Also sold under part numbers 267355, 267356, 244711, HSH21-40, KRT21, and KRT211.